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Elementary geometry / Foundations of geometry / Non-Euclidean geometry / Parallel postulate / Angle / Hyperbolic geometry / Giovanni Girolamo Saccheri / Saccheri quadrilateral / Euclidean geometry / Geometry / Spherical geometry / Omar Khayyam


1 The Question of Parallels We sketch a very brief history of certain aspects of geometry as background for the material in this book. Euclid is the central figure but is neither the beginning nor the end of our story.
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Document Date: 2016-01-17 19:31:11


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